氯盐侵蚀钢筋混凝土梁抗震性能研究

Seismic Performance of Reinforced Concrete Beams Corroded by Chloride

为了解氯盐侵蚀钢筋混凝土梁的抗震性能,采用经验证的氯盐侵蚀损伤钢筋混凝土梁精细化建模方法,建立了120个氯盐侵蚀钢筋混凝土梁的精细有限元模型。分析了钢筋锈蚀率、剪跨比、纵筋配筋特征值、配箍率、混凝土强度等级5个参数对氯盐侵蚀钢筋混凝土梁构件抗震性能的影响。结果表明:锈蚀率是影响氯盐侵蚀钢筋混凝土梁破坏模式的重要参数;纵筋配筋特征值和剪跨比对氯盐侵蚀钢筋混凝土梁的变形性能有较明显影响。研究成果可为氯盐侵蚀钢筋混凝土结构全寿命设计与抗震性能评估提供参考。

To study the effects of chloride erosion on the seismic performance of reinforced concrete(RC) beams, the finite element models of 120 RC beams corroded by chloride were established by using the numerical modelling method which was validated. The effects of corrosion ratio,shear-span ratio, longitudinal reinforcement characteristic value, stirrup ratio and concrete strength on the seismic performance of RC beams with chloride erosion were analyzed. Based on the numerical simulation results, it can be concluded that the corrosion ratio has an important effect on the failure mode of RC beams with chloride erosion. Both longitudinal reinforcement characteristic value and shear-span ratio affect the deformation performance of RC beams with chloride erosion significantly. The research results can be utilized for the life-cycle oriented seismic performance evaluation and design of RC structures.